Fluid-pressure brake



A111517, 1931- lc. A'. CAMPBELL 1,799,730

' FLUID PRESSURE A'BRAKE Filed Nov'. '7, 1929 2 Sheets-Sheet l April 7, l931- c. A. CAMPBELL 1,799,730

FLUID PRESSURE BRAKE Filed Nov. '7J 1929 2 Sheets-Sheet 2 which,-

Patented px". 7, 11931d UNITED STATES PATENT OFFICE CHARLES ALBERT CAMPBELL, OF W'A'lER/.IIOWN,V NEW YORK, ASSIGNOR TO THE NEW YORK AVIR BRAKE COMPANY, A CORPORATION OF NEW JERSEY FLUID-PRESSURE BRAKE Application ledNovember 7, 1929. ,Serial No. 405,487.

The present invention relates to air brake valves, and Vmore particularly to a back-up valve, that is, a valve disposed at the 'end of a train and adapted to apply the brakes while the train is being backed into a station or yard.

The invention comprises a rotary valve having a plurality of port lOpenings so arranged that, by means of suitable valve control mechanism, the valve is held in brake release position by hand and moves automatically to emergency application position if released. A signal or whistle is blown in one position of the valve, preferably a position where the brake valve is closed and the brakes thus maintained in release.

A further feature of the invention is the provision of a cock, associated with the valve, for closing the air line to the valve except when the valve is hung on a rail or other support at the end of the train.

The invention will be more clearly understood from the following description, taken with the accompanying drawings, in

Fig. 1 valve. y

Fig. 2 is a perspective view of the valve ports shown partly dismounted.

Figs. 3, 4 and 5 are sectional views taken on line 3 3 of Fig. 1, the parts being shown in release, signal and application positions respectively.

Fig. 6 is an end elevation of the valve in cluding the cut-off cock attached thereto, the open position of the hanger yoke being indicated by dotted lines; and

Fig. 7 is a side elevation corresponding to Fig. 6 butdrawn to a larger scale.

Referring to the drawings, the valve comprises a body or casing 11, bored centrally at 12 to provide a bearing-for the shaft 13. One end of the casing is finished to provide a seat 14 for arotary disk 15 which is slotted at 16 to receive a tongue 17 on the end of shaft is an axial section of the rotary 13. A dowel pin 13 on the shaft cooperates with a hole 19 in the disk to preclude incorrect assembly of the, valve parts. A. cap 2l closes the casing. The disk 15 is held against seat 14 by a spring 22 seated in a recessed boss 23 on the disk and a depression 24 in the closure cap.

.4t its other end the casing is recessed at 25 to receive a torque spring 26, the ends of which cooperatev with a lug 27 on collar 28 and pin 29 secured in the casing. The collar 23 is breached at 31 to fit a squared portion 32 of shaft 13 so that the spring normally urges the sha'fu and valve disk 15 to brake application position. This end of the casing is closed by a cover plate 33 held to the casing by screws 34 anda handle 35 is keyed or otherwise secured to the shaft 13 which projects through the cover plate.

Referring to Fig. 2, it will be seen that the end of casing 11 and disk 15 are each provided with longitudinal apertures or ports, those in the casing being indicated at 36, 37, 38 and 39, and the ports in the disk being numbered 41, 42, 43 and 44. Ports 36, and 41 are segmental and extend through relatively large arcs on the casing and disk respectively, the former communicating with the air line through the tapped inlet 40, and the latter with the space between the cap 21 and the bearing face of valve disk 15. Ports 36 and 41 communicate with each other in all positions of the valve 15. The ports 37, 38, are spaced from each other by a bridge 45, but both lead to an arcuate passage 46 in casing 11 terminating in an exhaust opening 47 in the side of the casing. The reason for using two ports 37, 38 is to reduce the necessary angular motion of the valve 15 between closed and full open positions.

Ports 42, 43 in the 4disk are substantially triangular in shape on the face of the disk which abuts the seat V14. rlihe purpose is to secure slow initial opening permitting a graduated opening, and hence service application valve operating handle 35. The plunger is .-z:

normally forced outwardly by a small spring (see Fig. G) and engages n h when the ports 39 and are in alineinent. rllhe spring which forces the plni x, ir outward not suflieiently strong te prevent the valve from being moved brake application position by torque spring 26 so that the valve will be moved directly from release to application position, if for any reasl n, the manual presi snre on the valve handle is released. The angular movement of the handle limited by stops 55, 5G on the cover plate 33, stop 55 holdino the l andle in brake application position, vinile 'op 5o indicates to the operator that he br e is in release position.

vince the valve normally urged to brake application po ion by he torque spring, it is netar iz. that a ent-onV coel; be inserted in the ai; lino vhen the valve is attached to the t il rllhere is, therefore, pro iided ci: having squared end porl shaped handle 59 body and is hooked rail. rflic valve Which strait to engage adapted to be nieve a an angle of 90o to opei, and close the i' .a (il to the brake valve, a lug (52 being rorinod on the handle 'for engaging stop shoulders 63, (34 on the valve body and thus limit the angular inovement of the handle is illustrated in 6 the closed position of the handle is indicated by full lines While the open position, that is, the position of the handle when the device is hung on a platform rail, is shown in dotted lines. The assembled brake valve and cut-ofi' cock is connected to the air line 65 by the end coupling 6G.

ln operating` the valve the operator first moves the bra :e valve handle to release position, after which the hooked handle of the cnt-oli' cock is raised to open the cock. rlhe device may then be hung on the platform rail. liv/*hilo the brake valve is being held against stop 5G, indicated by -he loiver dotted line in F G, the ports are in the relative positions shown in Fig. 8, at which time port 43 overlies wall 4.3 and ports 4l, 42 are in communication viith 36 and air inlet 40. rllhe compressed air in the valve therefore has no outlet.

ln F 4 the ports are shovvn in practically the same relation as that described With reference to Fig. 3 except that the small openings 39, 44 are alined, thus permitting air to pass to Whistle s hereinbefore explained, the plunger 523 on the valve ha die engages the notch 51 when the ports 39, 44 are in the i i i ion shovfn in Fig. 4.

li 1g. 5 illustrates the respective positions the several ports in braio applicati n position. Here ports 43 overlie the openings 37, 38 and ports 3G, 4l are in alinement. .ln this position of the valve, air passes from air inlet 40 through all of the ports, e-:c pt the signal ports, to the exhaust 47. lt is to be noted that ports 42, 43, as before stated, are substantially triangular in shape to permit gradual opening of the valve. Although the ports 42, 43 are illustrated as being spaced substantially the saine distance as ports 3T, 3S, they may be spaced further apart to obtain even more gradual opening of the valve. lt is also to be noted that ports 36 and 4l are open to each other at all times so that as long as the cnt-off cock is open, the space between the closure cap 2l and the valve disk is in constant connnunication with the air line.

The purpose of the cock 57 is to facilitate attachment of the back-up valve. lhen trie device is iirstattached, he cocl; 57 is in closed position so that 'when the angle cock at the end of the train is opened the brakes are not affected. She operator is thus able to attach the back-up valve and get to his position on the platform without interfering with the brakes. Once there, he shifts handle to release position, opens cock 57 and hangs the device on the handle hool; 59. ln removing the device, the operation is similar, irst the cock 5'? and then the angle cock being closed before detaching the device from the air hose.

F rom the description of the device and its operation it Will be apparent that the present invention provides for a bai k-np valve of the dead-man type in Which also incorporated a signal control. There is also coinbined With the brake valve a. cutsoif cool: interposed between the brake valve and air line and which, when the device hung on the platform rail, is opened to permit operai tion of the brake valve. rl`he rrangeinent and shape of the valve ports provi-fles for gradual application of the brakes by manual control, but if, for any reason, the operator is incapacitated, the torque spring innnediately opens the valve to initiate emergency application of the brakes.

A preferred embodiment of the invention has been illustrated and described, but it is to be understood that the details may be inodied to meet operating conditions.

lVhat is claimed is l. ln a bach-np valve, the combination of a casing; means for releasably connecting said easing With a brake pipe; a valve in said casing serving when open to vent said brake pipe to atmosphere; a spring constantly urging said valve to venting position; and a handle for closing said valve against the action of said spring.

2. ln a back-up valve, the combination of a casing; means for releasably connectingl said casing with a brake pipe; a. valve in saifl casing serving When open to vent said brake pipe to atmosphere; a spring constantly urging said valve to venting position; a handle for closing said valve against the action of said spring; a second valve adjacent the irst,

bil

said second valve When closed precluding the venting action of the first valve; and supporting means for said valves connected v/'ith the second valve and arranged to hold the same open When said supporting means is in use.

3. ln a baclnup valve, the combination of a casing having a brake pipe connection and a valve seat formed with an exhaust port and a signal port; a ported valve shiftable on said seat and serving to connect said bralre pipe connection in one position With said exhaust port, in another position with said signal port, and in a third position to disconnect said brake pipe 'connection from bothV said ports; yielding means constantly urging said valve to the lirst named position; a-

handle by means oi Which said valve may be shifted to said other positions; and an air operable signal connected With said signalv port.

1l. In a back-up valve, the combination oi" a casing having a brake pipe connection and a valve seat formed with plurality oi' exhaust ports and a signal port; a ported va ve shiitable on said seat and serving to connect said brake pipe connection in one position With said exhaust ports, in another position With said( signal port, and in a third position to disconnect said brake pipe connection from all of said ports; yielding means constantly urging said valve to the first named position; a handle by means of which said valve may be shifted against said yielding means to said other positions; an air operable signal connected with said signal port; and means for releasably connecting the brake pipe connection of said casing With a brake pipe.

5. In a back-up valve, the combination of a casing having a bralre pipe connection and a valve seat formed With an exhaust port and a signal port; a ported valve shiitable on said seat and serving to connect said bralfre pipe connection in one position With said exhaust port, in another position With said signal port, and in a third position to disconnect said brake pipe connection from both said ports; yielding means constantly urging said valve to the first-named position; a handle by means of which said valve may be shifted to said other positions; an air operable signal connected With said signal port; means for releasably connecting the brake pipe port of said casing with a brake pipe; stops tor defining the limiting positions oi said valve; and an impositive detent for indicating the intermediate position ci said valve.

6. In a back-upvalve, the combination of a casing having a brake pipe connection and a valve seat formed With a plurality of exhaust ports and a signal port; a ported valve shiitable on said seat and serving to connect said brake pipe connection in one position with said exhaust ports, in another position with said signal port, and in a third position to disconnect said brake pipefconnection from all of said. ports; yielding meansl constantly urging said valve to the first-named position; a handle by means of which said valve may be shifted against said yielding means to said other positions; an air operable signal connected f ith said signal port; means for releasably connecting the brake pipe port ot said casing with a bralre pipe; stops for deining the limiting positions of said valve; and an impositive detent for indicating the intermediate position orp said valve.

7. n a back-up valve, the combination of a casing having a brake pipe connection and a. valve seat formed With an exhaust port, and a signal port; a ported valve shitable on said seat vand serving to connect said brake pipe connection in one position With said exhaust port, in another position with said signal port, and in a third position to disconnect said brake pipe connection from both said ports; yielding means constantly urging said valve to the irst-named position; a handle by means of Which said valve may he shifted to said other positions; an air operable signal connected With said signal port; means for releasably connecting the brake pipe port of said casing With a brake pipe; a second valve adjacent said casing, and When closed serving to preclude the venting flow therethrough; and a combined support and actuator for the second valve arranged to maintain said second valve open when in supporting position.

. 8. in a baclrsup valve; the combination of a casing having a brake pipe connection and a valve seat formed With a plurality or" exhaust ports, and a signal port; a ported valve shiftable on said seat and serving to connect said brake pipe connection in one position with said exhaust ports, in another position With said signal port, and in a third Vposition to disconnect said brake pipe connection from all of said ports; yielding means constantly urging said valve to the kso first-named position; a handle by means of Y Which said valve may be shifted against-said yielding means to said otherrpositions; an air operable signal connected With said signal port; means i'or releasably connecting the brake pipe port oi'` said casingwith a brake pipe; a second valve adjacent said casing; and When closed serving to preclude the venting low therethrough; and a combined support and actuator for the second valve arranged to maintain said second valve open when in supporting position.

9. ln a back-up valve, the combination of a casing having a brake pipe connection and a seat provided Withan exhaust port; a ported valve shiftable on said seat alternately to connect and isolate said brake pipe connection to and from said exhaust port, at least one port being tapered to produce a slow-opening characteristic; a spring urgiis ing said valve in an exhaust opening direction; and a handle for shifting said Valve.

l0. In a back-up valve, the combination of a. casing having a brake pipe connection and r aseat provided with L plurality o" exhaust ports; a. ported valve shftahle on said seat alternaely co connect ano isolate said brake pipe connection to and from Said exhaus ports, at least one port being; tapered to produce n slow-opening characteristic; a spring urging seid valve in an exhaust opening clrecton; and a handle for shifting said Valve. In testimony Wheeof l have signed my name o this speccaton.

I' CHARLES ALBERT CAMPBELL 

